Move template assets to .env-driven generation.

Site metadata, images, favicons, and YouTube settings are now configured via .env and rendered from HTML/manifest templates at dev or container startup.

Co-authored-by: Cursor <cursoragent@cursor.com>

docker-compose-example/.env.example

@@ -3,11 +3,22 @@
 # Never commit .env with real credentials to version control.
 
 # --- Frontend Server ---
-# Port publikowany na hoście. W kontenerze nginx zawsze nasłuchuje na 80.
-# Mapowanie w docker-compose.yml: ${FRONTEND_PORT}:80
-# Dokploy/Traefik dodatkowo routuje po FQDN do wewnętrznego portu 80 kontenera.
 FRONTEND_PORT=8082
 
-# --- Po zakończeniu intro wideo ---
-# Adres docelowy przekierowania po zakończeniu odtwarzania filmu.
+# --- Strona (meta, SEO, PWA) ---
+SITE_TITLE="Slavic Pulse"
+SITE_SHORT_NAME="Slavic Pulse"
+SITE_BASE_URL=https://slavic-pulse.com
+SITE_DESCRIPTION="Lokalne modele LLM, własny serwer AI (Proxmox, TrueNAS, Ubuntu), RAG, Ollama, Open WebUI, bezpieczny self-hosting i wdrożenia biznesowe lokalnej AI."
+SITE_OG_IMAGE_ALT="Slavic Pulse"
+THEME_COLOR=#000000
+
+# --- Obrazy i ikony (ścieżki względem roota strony) ---
+BG_IMAGE=/assets/imgs/www-bg-slavic-pulse-com-001.jpg
+FAVICON_48=/assets/imgs/favico/48x48.png
+FAVICON_180=/assets/imgs/favico/180x180.png
+FAVICON_512=/assets/imgs/favico/512x512.png
+
+# --- YouTube ---
+VIDEO_ID=kujXXtoHUbc
 POST_VIDEO_REDIRECT_URL=https://www.youtube.com/watch?v=kujXXtoHUbc